[An additional insight into the significance of Lag B'omer: Each day of the Omer counting corresponds to another attribute or sefirah. It is on the 33rd day of the Omer that we reach the sefirah of hod shebehod ("splendor within splendor"). Now, the seven attributes are chesed, gevurah, teiferes, netzach, hod and yesod. Since Yesod facilitates bestowal from the preceding attributes into malchus, it is considered "external" to the preceding attributes. Thus, once we have reached the sefirah of hod shebehod, we have completed refining the "main body of the attributes."
Association with the Rebbe Maharash
It is also worth noting that the attributes are often counted not only from chesed through malchus, but also in reverse – from malchus through chesed. According to this second way, the 33rd day of the Omer corresponds to tiferes shebetiferes. Thus hod shebehod is related to tefires shebetiferes – famous as the birthday of the Rebbe Maharash (author of the approach of lechatíchila ariber).]
