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The emission from young stellar objects (YSOs) in the mid-IR is dominated bythe inner rim of their circumstellar disks. We present an IR-monitoring surveyof about 800 objects in the direction of the Lynds 1688 (L1688) star formingregion over four visibility windows spanning 1.6 years using the \emph{Spitzer}space telescope in its warm mission phase. Among all lightcurves, 57 sourcesare cluster members identified based on their spectral-energy distribution andX-ray emission. Almost all cluster members show significant variability. Theamplitude of the variability is larger in more embedded YSOs. Ten out of 57cluster members have periodic variations in the lightcurves with periodstypically between three and seven days, but even for those sources, significantvariability in addition to the periodic signal can be seen. No period is stableover 1.6 years. Non-periodic lightcurves often still show a preferred timescaleof variability which is longer for more embedded sources. About half of allsources exhibit redder colors in a fainter state. This is compatible withtime-variable absorption towards the YSO. The other half becomes bluer whenfainter. These colors can only be explained with significant changes in thestructure of the inner disk. No relation between mid-IR variability and stellareffective temperature or X-ray spectrum is found.

YSOVAR: Mid-IR variability in the star forming region Lynds 1688