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Optical illusions

The Old Imperium

by John Crowley,

Learning to live with my aging mind

Mirages

by Annie Dillard,

Reports

Art by Rene Parola,

Lines at play

Reports

Art by Hans-Georg Rauch,

Change your point of view

The Indian on the trail

by Mary Hartwell Catherwood,

Literary notes

by Laurence Hutton,

Editor’s drawer

by Harper’s Staff,

Popular exposition of some scientific experiments. Part III.–Things that are invisible.–The nature of sight.–Visual deceptions

by John William Draper,

Editor’s drawer

Debug