Patterns Kaleidoscope

The effect of LSD on perception is sometimes referred to as illusiogen-ic, because, rather than creating a perception of a nonexisting stimulus, LSD produces a distortion of sensory input from the environment (Kulberg 1986). Visual symptoms are most frequently experienced for example, vision may be blurred, and the perception of distance and depth may be changed. Objects in the surroundings may be perceived as unusually intense in color, shape, and/or size. With the eyes closed, geometric and kaleidoscopic patterns are perceived. Synesthesia, by which a sensory stimulus of one modality is transformed into a perception from another sense, is a type of a perceptual distortion typically experienced under the influence of LSD for example, smells... 

Such kaleidoscopic topochemical behaviour of 2 OPr is exemplified in Scheme 6 (Hasegawa, 1992). 2 OPr crystallizes with a-type packing [2 OPr(a)] from 1-propanol solution but into the jS-type [2 OPr(j3)] from a mixture of ethanol and water. On photoirradiation using a filter (>410 nm), the a-type homo-adduct dimer (2 OPr-a-dimer) and the jS-type heteroadduct dimer (2 OPr- -dimer) are produced from 2 OPr(a) and 2 OPr(j3), respectively, both in nearly quantitative yield. The dimer crystal 2 OPr-a-dimer as-prepared is entirely stable on photoirradiation whereas, on further photoirradiation without a filter, 2 OPr-)8-dimer is converted nearly quantitatively into a highly strained [2.2] paracyclophane (2 OPr-cyclo). The photostable 2 OPr- i -dimer crystal is, however, transformed into a highly photoreactive crystal complex (2 OPr-a-dimer-PrOH) if 2 OPr-a-dimer is recrystallized from 1-propanol solution. The crystal (2 OPr-a -dimer-PrOH) photopolymerizes into a crystalline a-type homo-adduct linear polymer. Judging from their X-ray diffraction patterns, recrystallized l3-type dimer (2 OPr-)8-dimer) has a different crystal structure from that of the crystal... 

Fig. 9.9. Kaleidoscope pattern. Each motif having threefold of rotation symmetry...

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